Troubleshooting steps
Check motor insulation resistance inspect motor cables check for moisture replace damaged components
Siemens VFD
F30021 – Ground fault
Current path to ground detected
Details
Drive detected current flowing to ground indicating insulation failure.
Error typefault
MeaningGround fault
Typical causesMotor winding insulation failure cable damage moisture ingress
SolutionsCheck motor insulation resistance inspect motor cables check for moisture replace damaged components
Severitycritical
Catalog references
Vendor Information
SiemensF30021
Utilities
Troubleshooting Steps
Other codes
Other Siemens VFD Codes
F30001 – Overcurrent fault
Overcurrent detected during motor operation
F30002 – Overvoltage fault
DC bus voltage too high
F30003 – Undervoltage fault
DC bus voltage too low
F30011 – Motor overtemperature fault
Motor temperature exceeds safe limit
F30012 – Drive overtemperature fault
Drive unit temperature too high
FAQ
Common questions
Is it safe to restart?
No. Ground fault indicates serious insulation failure. Repair before restarting.